2.11 The Orgstruct minor mode

If you like the intuitive way the Org mode structure editing and list
formatting works, you might want to use these commands in other modes like
Text mode or Mail mode as well. The minor mode orgstruct-mode makes
this possible. Toggle the mode with M-x orgstruct-mode RET, or
turn it on by default, for example in Message mode, with one of:

When this mode is active and the cursor is on a line that looks to Org like a
headline or the first line of a list item, most structure editing commands
will work, even if the same keys normally have different functionality in the
major mode you are using. If the cursor is not in one of those special
lines, Orgstruct mode lurks silently in the shadows.

When you use orgstruct++-mode, Org will also export indentation and
autofill settings into that mode, and detect item context after the first
line of an item.

You can also use Org structure editing to fold and unfold headlines in
any file, provided you defined orgstruct-heading-prefix-regexp:
the regular expression must match the local prefix to use before Org's
headlines. For example, if you set this variable to ";; " in Emacs
Lisp files, you will be able to fold and unfold headlines in Emacs Lisp
commented lines. Some commands like org-demote are disabled when the
prefix is set, but folding/unfolding will work correctly.